Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
  • B29C49/42—Component parts, details or accessories; Auxiliary operations
  • B29C49/78—Measuring, controlling or regulating
  • B29C49/783—Measuring, controlling or regulating blowing pressure
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
  • B29C49/18—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor using several blowing steps
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
  • B29C49/42—Component parts, details or accessories; Auxiliary operations
  • B29C49/78—Measuring, controlling or regulating
  • B29C49/783—Measuring, controlling or regulating blowing pressure
  • B29C2049/7831—Measuring, controlling or regulating blowing pressure characterised by pressure values or ranges
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
  • B29C49/42—Component parts, details or accessories; Auxiliary operations
  • B29C49/78—Measuring, controlling or regulating
  • B29C49/783—Measuring, controlling or regulating blowing pressure
  • B29C2049/7832—Blowing with two or more pressure levels
  • B29C2049/7833—Blowing with three or more pressure levels
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
  • B29C49/08—Biaxial stretching during blow-moulding
  • B29C49/16—Biaxial stretching during blow-moulding using pressure difference for pre-stretching, e.g. pre-blowing
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
  • B29C49/42—Component parts, details or accessories; Auxiliary operations
  • B29C49/4284—Means for recycling or reusing auxiliaries or materials, e.g. blowing fluids or energy
  • B29C49/42845—Recycling or reusing of fluid, e.g. pressure
  • B29C49/42855—Blowing fluids, e.g. reducing fluid consumption
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
  • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
  • Y02P70/10—Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working

Definitions

• the present invention relates to a gas blowing process of a package, such as a bottle, in a mold from a preform and recovery of the blowing gas for reuse as well as a device for the implementation of the method.
• the present invention also relates to a device for blowing packagings, in particular bottles, from a preform by means of a gas, such as air, and recovering said gas for reuse, comprising at least means for supplying the device with gas at a pre-blowing pressure and at two blowing pressures, for the implementation of the method.
• a gas such as air
• Another way of proceeding is to use only one compressor which compresses the gas at 40 bar, then to relax a part of the compressed gas at 10 bar for the pre-blowing operation. This method is also not very advantageous since energy is wasted to compress a gas whose pressure is reduced without having used it in the manufacturing process.
• the used compressed gas (which is at a pressure of about 40 bar) is released to the open air which is a waste of energy.
• the prior publication WO 96/25285 describes another method of blowing packaging, such as bottles from a preform.
• the preform is pre-blown at a pressure of between 8 and 12 bar, then the blowing itself is carried out by injecting air at 40 bar. Also in this document, the blowing gas is released to the open air once the package has been formed.
• the patent application EP 0 039 929 describes a method of blowing molded articles in which the blowing gas is recovered and recycled for reuse. More particularly, in this application, the blowing gas also has a function of treating the inner surface of the blown packaging, in particular to improve the impermeability of said inner surface, and for this purpose it contains a suitable reagent. Once blowing / treatment is performed, the blowing gas is recovered for subsequent reuse by means of a purge gas, said purge gas to be purified from the reagent used.
• US Patent 5,173,241 discloses a method and apparatus for recovering blowing air in a plastic injection machine to form a package.
• the blown air is recovered in a container of recovery, once the blowing ended by suction until a negative pressure in the blown packaging.
• the publication WO 03/009993 still describes another method and a device for recovering the blowing air.
• the operations follow one another as follows: -) pre-blowing; -) blowing and -) discharge with recovery of the blowing gas.
• EP-A-1518658 a first pressure is used for pre-blowing and a second pressure for blowing, at the end of the blowing formation a sweep is made inside the package at a lower pressure. at the blowing pressure. At the end of blowing, a portion of the gas can be recovered in a volume for subsequent use.
• the gas is recovered through a recovery valve in a recovery volume and is used to operate drawing cylinders, consumers of the packaging production machine or returned to a compressed air circuit of the machine. factory.
• the blowing pressure is always higher than the recovery pressure, it is not possible, a priori, to use the air recovered for blowing.
• An object of the invention is to improve known devices and methods.
• the present invention aims to provide a blowing machine and recovering the blowing gas of a simple operation and easy to adjust. Another object of the invention is to optimize the recovery of the blowing air in the machine and reduce its energy consumption and the necessary maintenance.
• Another object of the invention is to improve the recycling of the blowing gas.
• the recovered gas for example air
• the technique it is proposed to use the recovered gas, for example air, only for pre-blowing and blowing operations and not for other uses as taught by the state of the art. the technique.
• the method according to the invention comprises the following steps:
• gas recovered is provided for both the pre-blowing operation and for part of the blowing operation. Indeed, for this part of the blowing operation, the pressure of the blowing gas will be at most equal to the recovery pressure. Then, a "top-up" of high-pressure blowing gas is provided to achieve the desired blowing pressure.
• the pre-blowing pressure is obtained in a manner similar to WO 03/009993, then at the end of pre-blowing, a first blowing valve opens and the air used for the first phase of blowing. blowing is the one contained in a recovery tank. Once a predetermined blowing pressure is reached in the package, or after a certain time, a second blowing valve is opened and the pressure in the blown object increases to reach the final pressure required to form the object in question.
• the advantage of the method and the system according to the invention lies in the fact that the quantity of air, or blowing gas, supplied by the recovery system is used not only for the pre-blowing but also to perform a part blowing.
• Another advantage lies in the fact that the invention can be installed on existing machines which also reduces the costs of modification.
• the pressure values according to the invention to be considered are: -) first pressure, for pre-blowing, between 4 to 16 bar (P 1);
• the blowing method according to the invention by means of a gas of a package in a mold from a preform and recovery of the blowing gas, comprises at least the following stages: -) pre-blowing at a first pressure of the gas in the preform; -) blowing at a second and a third pressure of the gas in the preform to obtain the package; -) recovery of the gas at the second pressure until a pressure is obtained predetermined in the package;
• the pre-blowing stage lasts between 0.1s and 0.3s.
• the blowing step at the second pressure lasts up to 0.3 s.
• the blowing step at the third pressure lasts between 0.2s and 2s.
• the invention also proposes a device for implementing the method for blowing packagings, in particular bottles, into a mold from a preform, using a gas and recovering said gas, comprising at least means for supplying the device with gas at a first pressure and at a third pressure, means for stretching the packaging forming means, means for recovering said gas comprising at least one recovery volume associated with a valve of recovery, control means of said recovery means and said valve and adjustment means for adjusting the operation of said control means, characterized in that the device further comprises blowing supply means to a second blowing pressure from said recovery volume.
• said device is characterized in that the supply means for blowing at a second blowing pressure from said recovery volume comprise a valve and a duct.
• Figure 1 shows a block diagram of a machine known in the state of the art.
• Figure 2 schematically shows a blow curve according to the method of the invention.
• Figure 3 shows a block diagram of the method according to the invention.
• Figure 4 shows a blowing machine according to the invention.
• the blowing machine is a machine known per se in the state of the art and as described in the WO publication. 03/009993.
• a gas is supplied, for example air, at a first pressure, called pre-blow pressure of between 4 and 16 bar, for pre-blowing a preform 101.
• pre-blow pressure a first pressure
• the gas is brought to a second pressure, called the blowing pressure of the order of 25 to 40 bar, for blowing the package itself in the mold 102, through a blowing valve 104.
• the blowing pressure depends in particular on the complexity of the package to blow: the more the shape is simple and without special details and the blowing pressure may be low.
• the blowing gas is recovered until it reaches a pressure of about 17 bar in the blown package, the remainder of the expansion operating in the open air through the blower. exhaust 113.
• this recovered gas is then recycled for different uses.
• a first use that can be made is to reuse this gas under pressure to perform the pre-blowing operation.
• the recovery volume can be connected on the one hand to the pre-blowing circuit, which is schematized by the expression "pre-blowing" and the outlet 108, for example in a pre-blowing tank, not shown in FIG. the figure, which would be located before the pre-blow valve 103 in the circuit of the machine.
• the pre-blowing circuit which is schematized by the expression "pre-blowing" and the outlet 108, for example in a pre-blowing tank, not shown in FIG. the figure, which would be located before the pre-blow valve 103 in the circuit of the machine.
• a second use of which recovered gas can be made is to actuate drawing cylinders 110 of the preform.
• both pre-blowing and / or blowing are generally combined with longitudinal stretching of the preform 101 by means of said drawing ram 110 to combine a transverse and axial deformation of the preform.
• These cylinders are either mechanically actuated by a cam, or by means of a gas at a pressure between about 7 to 10 bar.
• the volume can also be connected to the control circuit of the drawing cylinders 110, possibly through a pressure reducer (not shown) to bring the gas to the pressure used for the actuation of the cylinders 110.
• This use is schematized by the output 109 of the recovery volume 107 and the cylinder 110.
• a third use of the recovered gas is to actuate other consumer elements of the blowing machine, which is schematized by the word "consumers” in Figure 1 and the output 111 of the recovery volume 107.
• a fourth use that can be made of recovered gas is to return it in the common gas supply pipes, including air, premises in which such machines are installed and also to supply the compressor of the blowing machine performing the compression at 40 bar of gas. Indeed, such industrial premises always use gas pressure to operate various machines and devices so that pressurized gas is always useful.
• This use is schematized by the outlet 112 of the recovery volume and by the expression "reservoir 0-10" of FIG.
• opening the valve 103 pre-blow is carried out the pre-blow at a first pressure of the gas (for example between 4 and 16 bar) in the preform 101 and the valve 103 is closed;
• the valve 104 is opened, blowing is performed at a second pressure of the gas (for example between 25 and 40 bar) in the preform to obtain the package and the blowing valve 104 is closed; -) opens the discharge valve 105 and the gas is recovered at the second pressure in a recovery volume 107 through the recovery valve 106 to obtain a third predetermined pressure in the blown packaging; -) as soon as the third predetermined pressure is reached, the recovery valve 106 is closed and the remaining blowing gas still under pressure in the package is discharged to the open air.
• a second pressure of the gas for example between 25 and 40 bar
• the blown packaging is removed from the blowing machine and continues its production cycle.
• the recovered gas is preserved for two uses: pre-blowing and part of the blowing.
• the blowing gas is recovered until a pressure of the order of 20 bar is reached in the recovery volume so as to be able to reuse this gas for part of the blowing, without losing it for other purposes, contrary to what is taught in the state of the art.
• FIG. 2 The method according to the invention is shown diagrammatically in FIG. 2 in the form of a graph in which the pressure / time blowing curve of a machine according to the invention and in the block diagram of FIG.
• this step performs a first portion of the blowing until a pressure P2 of the order of 20 bar with recovered gas provided by a recovery volume.
• blowing of the package is completed by supplying gas under high pressure to reach the final blowing pressure P3 of the order of 36 to 40 bar.
• blowing pressure P3 obtained, or after a certain time, one proceeds to the discharge of the gas present in the package and its recovery by the recovery means as described in the application WO 03/009993 for its use as blowing gas, as described above.
• the blowing machine for implementing the method according to the invention is now described with reference to FIG. 4.
• This machine comprises a mold 1 in which is located the packaging 2 which is formed by blowing, a recovery volume 3 in which the blowing gas is recovered and a high pressure supply 4 of gas.
• the recovery volume contains pressurized gas.
• a pre-blowing valve 4 is open and the gas contained in the volume 3 flows through the duct 5 through a pressure reducer 6 into the preform which will become the package 2.
• the pre-blowing valve 4 When the pre-blowing operation is completed, the pre-blowing valve 4 is closed and a first blowing valve 7 is opened which allows the gas contained in the volume 3 to flow through the duct 8 without passing through a pressure regulator in the partially blown packaging which will become the packaging 2.
• the blowing valve 9 is opened and the high-pressure gas (for example at 40 bar) is blown into the blower. partially blown package that will become packaging 2 from the supply 40.
• valves 7 and 9 are closed and the exhaust valve 10 and the recovery valve 10 'are opened, which allows the recovery of the blowing gas in the recovery volume. 3 through line 11, as described in WO 03/009993.
• the rest of the evacuation is carried out in the open air by the silencer 12.
• the conduits 5, 8, 11 also include the non-return valves 13, 14 and 15 to block the passage of the blowing gas appropriately, and in case of non-simultaneous operation of the valves.
• the supply for the pre-blowing and blowing operations is made directly from the high-pressure supply 4, through an expander 16 which is connected to the duct 5 by the conduit 17.
• This duct 17 also comprises a non-return 18. This way of proceeding allows to put in pressure the complete system or keep the machine running even if the recovery is not not used.
• the pressure at the outlet of the pressure reducer is of the order of 8 bar, which makes it possible to obtain a pressure of the order of 7 bar at the outlet of the expander 6, necessary to perform pre-blowing. In such a mode of operation, the blowing is carried out in a single operation.
• the recovery system in particular the recovery volume 3, increases in pressure during the cycles and little by little the pressure in the recovery volume is sufficient to allow the first part of the blowing such as described above.
• valves 7 and 9 for blowing at an intermediate pressure and at a final pressure are represented in series. In a variant, represented in dashed lines, these valves 7 and 9 can also be placed in parallel.
• valves of the system have a simultaneous operation. These valves are standard type as known in the state of the art.
• valve 10 may be a valve as described in WO 03/009993.
• valves are controlled by mechanical means known in themselves, for example comprising a cam actuating a distributor which controls the position of said valve.
• control means may be mechanical and / or associated with electrical means and sensors.
• the pressures indicated for pre-blowing and blowing may vary from the given values.
• pre-blowing it is possible to envisage values of the order of 4 to 16 bar, for the blowing at the pressure Pl of the values of the order of 14 to 22 bar and for the blowing at the pressure P3 of the values of the order of 30 to 40 bar.

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• Engineering & Computer Science (AREA)
• Manufacturing & Machinery (AREA)
• Mechanical Engineering (AREA)
• Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
• Processing Of Solid Wastes (AREA)
• Encapsulation Of And Coatings For Semiconductor Or Solid State Devices (AREA)
• Vacuum Packaging (AREA)

Applications Claiming Priority (2)

Publications (2)

Family

ID=36297391

Family Applications (1)

Country Status (9)

Cited By (2)

Families Citing this family (13)

Family Cites Families (18)

• 2005
  • 2005-08-23 FR FR0508681A patent/FR2889993B1/fr active Active
• 2006
  • 2006-08-18 DE DE602006003101T patent/DE602006003101D1/de active Active
  • 2006-08-18 WO PCT/IB2006/002250 patent/WO2007023349A1/fr active Application Filing
  • 2006-08-18 EP EP06765648A patent/EP1922206B1/de not_active Revoked
  • 2006-08-18 CN CN2006800305855A patent/CN101242946B/zh active Active
  • 2006-08-18 AT AT06765648T patent/ATE410292T1/de not_active IP Right Cessation
  • 2006-08-18 US US12/063,605 patent/US8287798B2/en active Active
  • 2006-08-18 BR BRPI0615080-2A patent/BRPI0615080A2/pt not_active Application Discontinuation
  • 2006-08-18 RU RU2008110966/12A patent/RU2391206C2/ru active

Non-Patent Citations (1)

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